ia32_sysvec.c

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    1 /*-
    2  * Copyright (c) 2002 Doug Rabson
    3  * Copyright (c) 2003 Peter Wemm
    4  * All rights reserved.
    5  *
    6  * Redistribution and use in source and binary forms, with or without
    7  * modification, are permitted provided that the following conditions
    8  * are met:
    9  * 1. Redistributions of source code must retain the above copyright
   10  *    notice, this list of conditions and the following disclaimer.
   11  * 2. Redistributions in binary form must reproduce the above copyright
   12  *    notice, this list of conditions and the following disclaimer in the
   13  *    documentation and/or other materials provided with the distribution.
   14  *
   15  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
   16  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   17  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   18  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
   19  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   20  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   21  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   22  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   23  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   24  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   25  * SUCH DAMAGE.
   26  */
   27 
   28 #include <sys/cdefs.h>
   29 __FBSDID("$FreeBSD$");
   30 
   31 #include "opt_compat.h"
   32 
   33 #define __ELF_WORD_SIZE 32
   34 
   35 #include <sys/param.h>
   36 #include <sys/exec.h>
   37 #include <sys/fcntl.h>
   38 #include <sys/imgact.h>
   39 #include <sys/kernel.h>
   40 #include <sys/lock.h>
   41 #include <sys/malloc.h>
   42 #include <sys/mutex.h>
   43 #include <sys/mman.h>
   44 #include <sys/namei.h>
   45 #include <sys/pioctl.h>
   46 #include <sys/proc.h>
   47 #include <sys/procfs.h>
   48 #include <sys/resourcevar.h>
   49 #include <sys/systm.h>
   50 #include <sys/signalvar.h>
   51 #include <sys/stat.h>
   52 #include <sys/sx.h>
   53 #include <sys/syscall.h>
   54 #include <sys/sysctl.h>
   55 #include <sys/sysent.h>
   56 #include <sys/vnode.h>
   57 #include <sys/imgact_elf.h>
   58 
   59 #include <vm/vm.h>
   60 #include <vm/vm_kern.h>
   61 #include <vm/vm_param.h>
   62 #include <vm/pmap.h>
   63 #include <vm/vm_map.h>
   64 #include <vm/vm_object.h>
   65 #include <vm/vm_extern.h>
   66 
   67 #include <compat/freebsd32/freebsd32_signal.h>
   68 #include <compat/freebsd32/freebsd32_util.h>
   69 #include <compat/freebsd32/freebsd32_proto.h>
   70 #include <compat/freebsd32/freebsd32_syscall.h>
   71 #include <compat/ia32/ia32_signal.h>
   72 #ifdef __amd64__
   73 #include <machine/psl.h>
   74 #include <machine/segments.h>
   75 #include <machine/specialreg.h>
   76 #else
   77 #include <i386/include/psl.h>
   78 #include <i386/include/segments.h>
   79 #include <i386/include/specialreg.h>
   80 #endif
   81 #include <machine/frame.h>
   82 #include <machine/md_var.h>
   83 #include <machine/pcb.h>
   84 #include <machine/cpufunc.h>
   85 
   86 CTASSERT(sizeof(struct ia32_mcontext) == 640);
   87 CTASSERT(sizeof(struct ia32_ucontext) == 704);
   88 CTASSERT(sizeof(struct ia32_sigframe) == 800);
   89 CTASSERT(sizeof(struct siginfo32) == 64);
   90 #ifdef COMPAT_FREEBSD4
   91 CTASSERT(sizeof(struct ia32_mcontext4) == 260);
   92 CTASSERT(sizeof(struct ia32_ucontext4) == 324);
   93 CTASSERT(sizeof(struct ia32_sigframe4) == 408);
   94 #endif
   95 
   96 static register_t *ia32_copyout_strings(struct image_params *imgp);
   97 static void ia32_fixlimit(struct rlimit *rl, int which);
   98 
   99 extern struct sysent freebsd32_sysent[];
  100 
  101 SYSCTL_NODE(_compat, OID_AUTO, ia32, CTLFLAG_RW, 0, "ia32 mode");
  102 
  103 static u_long   ia32_maxdsiz = IA32_MAXDSIZ;
  104 SYSCTL_ULONG(_compat_ia32, OID_AUTO, maxdsiz, CTLFLAG_RW, &ia32_maxdsiz, 0, "");
  105 TUNABLE_ULONG("compat.ia32.maxdsiz", &ia32_maxdsiz);
  106 static u_long   ia32_maxssiz = IA32_MAXSSIZ;
  107 SYSCTL_ULONG(_compat_ia32, OID_AUTO, maxssiz, CTLFLAG_RW, &ia32_maxssiz, 0, "");
  108 TUNABLE_ULONG("compat.ia32.maxssiz", &ia32_maxssiz);
  109 static u_long   ia32_maxvmem = IA32_MAXVMEM;
  110 SYSCTL_ULONG(_compat_ia32, OID_AUTO, maxvmem, CTLFLAG_RW, &ia32_maxvmem, 0, "");
  111 TUNABLE_ULONG("compat.ia32.maxvmem", &ia32_maxvmem);
  112 
  113 struct sysentvec ia32_freebsd_sysvec = {
  114         FREEBSD32_SYS_MAXSYSCALL,
  115         freebsd32_sysent,
  116         0,
  117         0,
  118         NULL,
  119         0,
  120         NULL,
  121         NULL,
  122         elf32_freebsd_fixup,
  123         ia32_sendsig,
  124         ia32_sigcode,
  125         &sz_ia32_sigcode,
  126         NULL,
  127         "FreeBSD ELF32",
  128         elf32_coredump,
  129         NULL,
  130         MINSIGSTKSZ,
  131         IA32_PAGE_SIZE,
  132         0,
  133         FREEBSD32_USRSTACK,
  134         FREEBSD32_USRSTACK,
  135         FREEBSD32_PS_STRINGS,
  136         VM_PROT_ALL,
  137         ia32_copyout_strings,
  138         ia32_setregs,
  139         ia32_fixlimit,
  140         &ia32_maxssiz
  141 };
  142 
  143 
  144 static Elf32_Brandinfo ia32_brand_info = {
  145                                                 ELFOSABI_FREEBSD,
  146                                                 EM_386,
  147                                                 "FreeBSD",
  148                                                 NULL,
  149                                                 "/libexec/ld-elf.so.1",
  150                                                 &ia32_freebsd_sysvec,
  151                                                 "/libexec/ld-elf32.so.1",
  152                                                 BI_CAN_EXEC_DYN,
  153                                           };
  154 
  155 SYSINIT(ia32, SI_SUB_EXEC, SI_ORDER_ANY,
  156         (sysinit_cfunc_t) elf32_insert_brand_entry,
  157         &ia32_brand_info);
  158 
  159 static Elf32_Brandinfo ia32_brand_oinfo = {
  160                                                 ELFOSABI_FREEBSD,
  161                                                 EM_386,
  162                                                 "FreeBSD",
  163                                                 NULL,
  164                                                 "/usr/libexec/ld-elf.so.1",
  165                                                 &ia32_freebsd_sysvec,
  166                                                 "/libexec/ld-elf32.so.1",
  167                                                 BI_CAN_EXEC_DYN,
  168                                           };
  169 
  170 SYSINIT(oia32, SI_SUB_EXEC, SI_ORDER_ANY,
  171         (sysinit_cfunc_t) elf32_insert_brand_entry,
  172         &ia32_brand_oinfo);
  173 
  174 
  175 void
  176 elf32_dump_thread(struct thread *td __unused, void *dst __unused,
  177     size_t *off __unused)
  178 {
  179 }
  180 
  181 
  182 /* XXX may be freebsd32 MI */
  183 static register_t *
  184 ia32_copyout_strings(struct image_params *imgp)
  185 {
  186         int argc, envc;
  187         u_int32_t *vectp;
  188         char *stringp, *destp;
  189         u_int32_t *stack_base;
  190         struct freebsd32_ps_strings *arginfo;
  191         int szsigcode;
  192 
  193         /*
  194          * Calculate string base and vector table pointers.
  195          * Also deal with signal trampoline code for this exec type.
  196          */
  197         arginfo = (struct freebsd32_ps_strings *)FREEBSD32_PS_STRINGS;
  198         szsigcode = *(imgp->proc->p_sysent->sv_szsigcode);
  199         destp = (caddr_t)arginfo - szsigcode - SPARE_USRSPACE -
  200                 roundup((ARG_MAX - imgp->args->stringspace), sizeof(char *));
  201 
  202         /*
  203          * install sigcode
  204          */
  205         if (szsigcode)
  206                 copyout(imgp->proc->p_sysent->sv_sigcode,
  207                         ((caddr_t)arginfo - szsigcode), szsigcode);
  208 
  209         /*
  210          * If we have a valid auxargs ptr, prepare some room
  211          * on the stack.
  212          */
  213         if (imgp->auxargs) {
  214                 /*
  215                  * 'AT_COUNT*2' is size for the ELF Auxargs data. This is for
  216                  * lower compatibility.
  217                  */
  218                 imgp->auxarg_size = (imgp->auxarg_size) ? imgp->auxarg_size
  219                         : (AT_COUNT * 2);
  220                 /*
  221                  * The '+ 2' is for the null pointers at the end of each of
  222                  * the arg and env vector sets,and imgp->auxarg_size is room
  223                  * for argument of Runtime loader.
  224                  */
  225                 vectp = (u_int32_t *) (destp - (imgp->args->argc + imgp->args->envc + 2 +
  226                                        imgp->auxarg_size) * sizeof(u_int32_t));
  227 
  228         } else
  229                 /*
  230                  * The '+ 2' is for the null pointers at the end of each of
  231                  * the arg and env vector sets
  232                  */
  233                 vectp = (u_int32_t *)
  234                         (destp - (imgp->args->argc + imgp->args->envc + 2) * sizeof(u_int32_t));
  235 
  236         /*
  237          * vectp also becomes our initial stack base
  238          */
  239         stack_base = vectp;
  240 
  241         stringp = imgp->args->begin_argv;
  242         argc = imgp->args->argc;
  243         envc = imgp->args->envc;
  244         /*
  245          * Copy out strings - arguments and environment.
  246          */
  247         copyout(stringp, destp, ARG_MAX - imgp->args->stringspace);
  248 
  249         /*
  250          * Fill in "ps_strings" struct for ps, w, etc.
  251          */
  252         suword32(&arginfo->ps_argvstr, (u_int32_t)(intptr_t)vectp);
  253         suword32(&arginfo->ps_nargvstr, argc);
  254 
  255         /*
  256          * Fill in argument portion of vector table.
  257          */
  258         for (; argc > 0; --argc) {
  259                 suword32(vectp++, (u_int32_t)(intptr_t)destp);
  260                 while (*stringp++ != 0)
  261                         destp++;
  262                 destp++;
  263         }
  264 
  265         /* a null vector table pointer separates the argp's from the envp's */
  266         suword32(vectp++, 0);
  267 
  268         suword32(&arginfo->ps_envstr, (u_int32_t)(intptr_t)vectp);
  269         suword32(&arginfo->ps_nenvstr, envc);
  270 
  271         /*
  272          * Fill in environment portion of vector table.
  273          */
  274         for (; envc > 0; --envc) {
  275                 suword32(vectp++, (u_int32_t)(intptr_t)destp);
  276                 while (*stringp++ != 0)
  277                         destp++;
  278                 destp++;
  279         }
  280 
  281         /* end of vector table is a null pointer */
  282         suword32(vectp, 0);
  283 
  284         return ((register_t *)stack_base);
  285 }
  286 
  287 static void
  288 ia32_fixlimit(struct rlimit *rl, int which)
  289 {
  290 
  291         switch (which) {
  292         case RLIMIT_DATA:
  293                 if (ia32_maxdsiz != 0) {
  294                         if (rl->rlim_cur > ia32_maxdsiz)
  295                                 rl->rlim_cur = ia32_maxdsiz;
  296                         if (rl->rlim_max > ia32_maxdsiz)
  297                                 rl->rlim_max = ia32_maxdsiz;
  298                 }
  299                 break;
  300         case RLIMIT_STACK:
  301                 if (ia32_maxssiz != 0) {
  302                         if (rl->rlim_cur > ia32_maxssiz)
  303                                 rl->rlim_cur = ia32_maxssiz;
  304                         if (rl->rlim_max > ia32_maxssiz)
  305                                 rl->rlim_max = ia32_maxssiz;
  306                 }
  307                 break;
  308         case RLIMIT_VMEM:
  309                 if (ia32_maxvmem != 0) {
  310                         if (rl->rlim_cur > ia32_maxvmem)
  311                                 rl->rlim_cur = ia32_maxvmem;
  312                         if (rl->rlim_max > ia32_maxvmem)
  313                                 rl->rlim_max = ia32_maxvmem;
  314                 }
  315                 break;
  316         }
  317 }
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FreeBSD/Linux Kernel Cross Reference sys/compat/ia32/ia32_sysvec.c

FreeBSD/Linux Kernel Cross Reference
sys/compat/ia32/ia32_sysvec.c
